Bacterial pneumonia is an infection caused by the presence of bacteria within the lungs. The most common cause of this type of infection is a bacterium called streptococcus pneumoniae, according to the Cleveland Clinic.

Walking pneumonia is the common term for pneumonia that has mild symptoms and is typically not life-threatening. (see ref 2) Pneumonia is a lung infection that may be caused by a bacteria, a fungus or a virus.

Pneumonia is a medical term used to describe an infection within the small air sacs in your lungs. This infection can affect both children and adults and is caused by pathogens (bacteria, viruses or fungi) that invade the airway passages.

Pneumonia is a long-lasting, often severe and occasionally fatal lower-respiratory illness. It can occur in one or both lungs and make it difficult for a person to go about daily life.

Double pneumonia is a lung infection that can be caused by bacteria, parasites, viruses or fungi. The term "double" means both lungs are infected. Though some people may only experience mild forms of pneumonia this condition can be life threatening if left untreated.

Dust pneumonia is an acute type of respiratory distress that can develop into an infection of the lungs. Typically, it is brought on by excessive exposure to dust and dirt inhalation.

Bronchial pneumonia, also called bronchopneumonia, infects the bronchioles, the tubes leading to the lungs and the lungs themselves. Bronchial pneumonia affects millions of Americans each year, particularly the elderly and immunocompromised. Many different bacteria, viruses or fungi can cause bronchial pneumonia.

According to the Centers for Disease Control and Prevention, until 2000, strep pneumonia causes 100,000 to 135,000 hospitalizations per year. Because of the pneumonia vaccine this rate has decreased to 13 cases per 100,000 people, says the CDC.